Recently, I came across this outstanding interview with Eugene Fama published by The Market / NZZ. Besides the main subject discussed -the inability of central banks to control inflation-, the interview is intertwined with gripping assertions about the limits of knowledge, such as the following ones:
Bubbles are things people see in hindsight. They don’t identify them in advance. Sure, you can look at the behavior of prices, and you may be able to identify cases where they are too high. But if you only look back and say: «Oh, stocks went down a lot, so that was a bubble», then that’s 20/20 hindsight. At the time, there was no evidence that there was a bubble.
I don’t say markets are completely efficient, but they’re efficient for most questions that I address. Models are never a 100 % true. If they were, we would call them reality…
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Utopia, you are standing in it! 
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